Deere7020 Posted May 28, 2013 Report Share Posted May 28, 2013 Have a 1991 cutlass supreme sl 3.4 liter won't start changed fuel pump strainer, and filter. Have fuel to test valve. Also have spark but when cranked. Won't start. Also checked plugs and they are dry. Need some help please Quote Link to comment Share on other sites More sharing options...
Galaxie500XL Posted May 28, 2013 Report Share Posted May 28, 2013 Are you positive (since you say it's a 3.4) that the timing belt hasn't packed it in, and the car is not out of time? Have a 1991 cutlass supreme sl 3.4 liter won't start changed fuel pump strainer, and filter. Have fuel to test valve. Also have spark but when cranked. Won't start. Also checked plugs and they are dry. Need some help please Quote Link to comment Share on other sites More sharing options...
Psych0matt Posted May 28, 2013 Report Share Posted May 28, 2013 sounds like the timing belt either went, or one of the pulleys. If you're getting spark and fuel, pull the belt inspection cover off (2 8mm bolts) and make sure it's all good Quote Link to comment Share on other sites More sharing options...
Deere7020 Posted May 28, 2013 Author Report Share Posted May 28, 2013 Thanks. It's not an interference motor is it? Quote Link to comment Share on other sites More sharing options...
95LQ1VERT Posted May 28, 2013 Report Share Posted May 28, 2013 From my understanding 91-95 are non interference and 96-97 are interference because of the redesigning of the heads and intake manifolds Sent from my HTC One V using Tapatalk 2 Quote Link to comment Share on other sites More sharing options...
Deere7020 Posted May 28, 2013 Author Report Share Posted May 28, 2013 From my understanding 91-95 are non interference and 96-97 are interference because of the redesigning of the heads and intake manifolds Sent from my HTC One V using Tapatalk 2 Thanks will check tomorrow. Appreciate the help Quote Link to comment Share on other sites More sharing options...
Schurkey Posted May 29, 2013 Report Share Posted May 29, 2013 A compression test will tell that tale. I'd expect at least some of the plugs to be wet if the timing belt choked and puked. First guess: No injector spray. Will it run on starting fluid/aerosol carb cleaner? Quote Link to comment Share on other sites More sharing options...
Deere7020 Posted May 29, 2013 Author Report Share Posted May 29, 2013 Thanks will check tomorrow. Appreciate the help Took inspection cover off and timing belt is moving when engine is cranked Quote Link to comment Share on other sites More sharing options...
White93z34 Posted May 29, 2013 Report Share Posted May 29, 2013 sounds like no injector pulse. I had a defective injector cause the same condition. Quote Link to comment Share on other sites More sharing options...
Deere7020 Posted May 29, 2013 Author Report Share Posted May 29, 2013 sounds like no injector pulse. I had a defective injector cause the same condition. How so I check that? With a noid tester? Quote Link to comment Share on other sites More sharing options...
carkhz316 Posted May 29, 2013 Report Share Posted May 29, 2013 You can use one, but a test light works just the same. I just went through this on my '92. Unfortunately with that batch-fire setup of the MPFI, if even one injector goes bad, specifically if it shorts with a low internal resistance (my #5 cylinder injector ohm'd out at .4 ohms. Spec is 9-13 ohms), the ECM will disable all of the injectors since they all share the same ground (though the ECM uses 2 drivers:think: I haven't figured out why that is exactly). Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted May 29, 2013 Report Share Posted May 29, 2013 ECM has 1 driver, current is shared across 2 pins. /tehmoaruno Quote Link to comment Share on other sites More sharing options...
Deere7020 Posted May 30, 2013 Author Report Share Posted May 30, 2013 had number 3 injector ohm out at .6. Will change and let you guys know Quote Link to comment Share on other sites More sharing options...
White93z34 Posted May 30, 2013 Report Share Posted May 30, 2013 How so I check that? With a noid tester? I used a regular old 194 automotive lamp spread out into the injector plug. However I got lucky and the first one I unplugged (cyl 4, front) just so happened to be the bad one and when I tried to check for pulse the car jumped to life. Quote Link to comment Share on other sites More sharing options...
Deere7020 Posted June 1, 2013 Author Report Share Posted June 1, 2013 I used a regular old 194 automotive lamp spread out into the injector plug. However I got lucky and the first one I unplugged (cyl 4, front) just so happened to be the bad one and when I tried to check for pulse the car jumped to life. Update on car changed injector and idle air control valve. Got it to run but idles at 3000 rpm and when give it gas it just jumps around 3000/3500 Quote Link to comment Share on other sites More sharing options...
Garrett Powered Posted June 1, 2013 Report Share Posted June 1, 2013 I should buy shares of IAC instead of explaining what it is and does all the time Quote Link to comment Share on other sites More sharing options...
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